Shaper hood



Patentedv Dec. 10, 1929 UNITED Asif'rArEs PATENT OFFICE nGHRALDTYHURLBUBT, or DETROIT, MICHIGAN, ASSIGNCR To THE ALLINGToN a CURTISMANUFACTURING COMPANY, or SAGINAW, MICHIGAN, A CORPORATION or MICHIGAN ySHAI'IIH Hoon vApplication ineav september 19, 1927. serial No. 220,453.

10i therefore, is the provision of a shaper hood having a dischargeopening for continuously getting rid of the heavier pieces by droppingthem outlof the hood by gravity upon the floor or into a suitablereceptacle for periodical removal.

`Afurther important object of the inven tion isfthe provision of anadjustable. baiie plate to vcontrol thesuction and therefore the Yupward tendency of the heavier particlesl so that too much of thismaterial will not be in suspension in the vertical suction pipe for toolong a time. j g y Other important objects will appear hereinafter, .thedrawings illustrating a preferred embodiment ofthe invention.-

In the drawings- Figure 1 is an elevation of a Shaper hood constructedin accordance With the principles of this invention and located adjacenta rotating lshaper head; and Y Figure 2 is a plan view of the hoodillustrating a Shaper head for making a side cut upon a piece oftimber.l

In wood working factories equipped with exhaust fans and dust collectingsystems of pipes, it is customary to employ such machines as Shaperswith rapidly rotating cut ter heads for making side cuts on pieces oflumber and heretofore great difficulty has been experienced with hoodsattached to the suction pipes for these machines on account of largepieces, splinters, knots, etc., from the lumber, in addition to thenormal and liner shavings ordinarily made by the cutter head. The'heavypieces thrown by the knives into the hood are too heavy to be taken upby suction through the vertical suction pipe and consequently theseparts accumulate in the back of the hood and gradually clog it up.

The' present invention proposes to overcome this objection by providinga discharge opening below the vertical section of the hood from whichthe larger pieces may be discharged by gravity. In accomplishing thisresult it is found desirable to provide avariable baffle plate which maybe adjusted to control the suction, depending upon the size of -themachines and the character of the cutting which is being done. i

Referring more particularly to the drawings, the suction hood is locatedadjacent a cutter head 4 mounted upon a vertical spindlel 5in bearings 6and rotated in any well known manner by a belt 7 and pulley 8. Thiscutter may be provided with adjustable blades 9 adapted to make a sidecut, for example, upon, apiece of'lumber 10 which is moved progressivelyinto cutting position.

The hood is ordinarily supported adjustaj bly on a machine tableadjacent the cutter head and is made of sheet metal'with a somewhatirregular 'flaring receiverll having sides 12 and 13, varying in length,and top and bottoml pieces 14 conforming thereto to provide an opening15 which is inclined to the direction of feed of the lumber 10, thelonger side 13 being disposed inthe direction from which the lumber 10is fed so that the particles which fly from the cutter head will beengaged f thereby. The upper edge of the opening may be provided with alip 16 for strengthening and protecting this portion of the hood andthe'interior surfaces of the receiver are provided with removable liners17 which may be replaced as they become worn.

At the reduced end ofthe receiver 11 is a hood section -18 substantiallyrectangular in cross section-tov conform to the receiver 11 and having asuction head 19 at the top reduced to a "circular extremity forreceiving a suction pipe 20. At the bottoml of the section 18 is anupwardly inclined shoulder 21 beyond which is an opening 22 below thesuction head 19 or at the bottom ofvan inclined rear wall 23 which leadsdirectly' to the opening 22. p

In the hood section 18 is a baffle plate 24 disposed directly above theinclined shoulder 21', which is movable at an langle into the secf tion18jto restrict or enlarge .the opening betweenthe 'shoulder 21V andthebalile plate,

thereby varying the suction for the receiving end ot the hood. Thisbattle plate may be adjusted by bending it within the hood or it mayeven extend through a suitable slit at the upper edge of the section 18and be variable from the outside of the hood.

ln operation the velocity ot the material thrown oii' by the cutter headwill throwl the material vell up into the hood, and the suction willdraw the lighter particles up through the suction pipe 2O in a wellknown manner. The baille plate 24 is adjusted to control the suction forheavier particles so that they will not be held insuspension inthevertical portion of the hood but will drop by gravity through theopening 22 or against the inclined wall 23 and thence through theopening 22. The actual sizes and dimensions ot' these hoods depend uponthe size oit the machines tor which they are used and the character oit'the work to be done, but it is found that hoods of this kind will savefully one half of the power otherwise required for keeping ordinaryhoods and pipes clear.

lt is obvious that various changes may be made in the construction,combination and arrangement o'tthe parts without departing from thespirit and scope et this invention.

I claim:

l, En a suction hood for dust collecting systems, a converging receptionportion opened at the end, a vertical suction discharge, a housingconnecting the discharge and the reception portion comprising an openingbelow the suction discharge, and an inclined wall extending below thedischarge and leading` to the edge of the opening.

A suction hood for wood working inachines having a flaring openingdisposed adjacent the machine, a vertical suction pipe connection and aconnecting portion between the suction pipe connection and the haringopening, a baille plate adjustable in the connecting portion to vary thesuction as desired.

A suction hood for dust collecting, having a receiving opening at oneend, a vertical suction pipe' at the other end, an opening in the hoodbelow the suction pipe opening, and an adjustable battle plate in thehood above the said opening for varying the suction depending upon thecharacter of materia-'l to be collected.

fl. A suction hood for dust 'collecting systems, havingl a receivingopening at one end, a. vertical suction pipe opening at the other end,an inclined wall below the suction pipe opening", a bottom opening atthe lower end ot the inclined wall, and a bathe plate within the hoodabove the said bottoni opening to control the suction at the receivingend of the hood.

5. A collecting hood for saw dust or the like, having a receivingopening at` one end, a suction opening at the other end, an inclinedwall below the suction opening, a-

shoulder in the bottom ot the hood at a disu tance from the lower end oftheinclined wall, a discharge opening between the shoulder and the lowerend of the inclined wall, and a battle plate in the hood above the saidshoulder for controlling the suction at the receiving opening.

6. A suction hood for collecting saw dust and the like, comprising arectangular open end portion and an opposite circular suction pipeoutlet and an intermediate connecting portion; the connecting portionhaving an inclined wall below the suction opening with a dischargeoutlet atV the bottoni thereo't, and a raised projection in the bottomwall at the other side ot the opening; and a movable batiie plate in theconnecting portion of the hood above the bottom projection and thedischarge opening -for controlling the suction at the open end.

7. In a suction hood for dust collecting systems, a suction pipeconnection, an inclined wall below the pipe connection7 and a d bargeopening at the bottom ot the inclined wall so that large heavy piecesdrawn into the hood may be discharged by gravity therefrom, meanstorining a variable suction control above the discharge opening in thehood, and a rectangular flaring receiving portion having opposite sidesone longer than the other, a strengthening` lip overhanging the opening`thereot', and metal liners for protecting the insides oli the receivingportion.

8. A. suction hood' for collecting saw dust having an open end forming areceiver, a suction outlet at the top' ot the opposite end, and adischarge opening in the bottoni, and a baiile plate bendable in thehood for varying the suction therein.

GERALD TY HURLBURT.

